Feature/centroids as gdf

[chahank]

Changes proposed in this PR:

• Make all the centroids data to be stored in a geodataframe attribute
• Removes and simplifies a lot of the methods.

This is a DRAFT, and comments are welcome. Not all tests are already running through as many tests are using the centroids class even though they should not. But this will be fixed once we converge to a final result.

This pull request is getting close to review-ready, pending some open discussion points (see below).

PR Author Checklist

• Read the Contribution Guide
• Correct target branch selected (if unsure, select develop)
• Descriptive pull request title added
• Source branch up-to-date with target branch
• Documentation updated
• Tests updated
• Tests passing
• No new linter issues
• Changelog updated

PR Reviewer Checklist

• Read the Contribution Guide
• CLIMADA Reviewer Checklist passed
• Tests passing
• No new linter issues

[tovogt]

I just wanted to drop here for reference the following point:

Centroids coordinates used to be reliably in lat/lon coordinates (epsg4326). Or at least that's what I assumed. Now that they are in a GeoDataFrame with a "serious" crs attribute, we should probably make sure that none of the functions that use centroids just blindly assume that the Centroids.coord attribute is in lat/lon. That applies to trop_cyclone (and tc_rainfield in petals), but it might also apply to other modules.

[idetring]

Test and Unittests have been updated and complemented to about a coverage of 80%. Former tests in test_vec_ras.py have been incorporated into the test_centr.py mostly as they were, which still results in some doubling of testing ideas.